<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <title>Advanced View Positioning</title>
    <style>
      .mapcontainer {
        position: relative;
        margin-bottom: 20px;
      }
      .map {
        width: 1000px;
        height: 600px;
      }
      .map .ol-zoom {
        top: 178px;
        left: 158px;
      }
      .map .ol-rotate {
        top: 178px;
        right: 58px;
      }
      .map .ol-attribution,
      .map .ol-attribution.ol-uncollapsible {
        bottom: 30px;
        right: 50px;
      }
      .padding-top {
        position: absolute;
        top: 0;
        left: 0px;
        width: 1000px;
        height: 170px;
        background: rgba(255, 255, 255, 0.5);
      }
      .padding-left {
        position: absolute;
        top: 170px;
        left: 0;
        width: 150px;
        height: 400px;
        background: rgba(255, 255, 255, 0.5);
      }
      .padding-right {
        position: absolute;
        top: 170px;
        left: 950px;
        width: 50px;
        height: 400px;
        background: rgba(255, 255, 255, 0.5);
      }
      .padding-bottom {
        position: absolute;
        top: 570px;
        left: 0px;
        width: 1000px;
        height: 30px;
        background: rgba(255, 255, 255, 0.5);
      }
      .center {
        position: absolute;
        border: solid 1px black;
        top: 490px;
        left: 560px;
        width: 20px;
        height: 20px;
      }
    </style>
  </head>
  <body>
    <!-- 
      疑惑点: 地图周边的阴影区域时怎么实现的?
      解答: 地图区域是不变的,只是在地图的上方添加div标签通过背景色和透明度实现;
      疑惑点: 为什么在地图的阴影区域不能操作?
      解答: 使用了css3的样式user-select: none;和pointer-events: none;
    -->
    <div class="mapcontainer">
      <div id="map" class="map"></div>
      <div class="padding-top"></div>
      <div class="padding-left"></div>
      <div class="padding-right"></div>
      <div class="padding-bottom"></div>
      <div class="center"></div>
    </div>
    <button id="zoomtoswitzerland">Zoom to Switzerland</button> (best fit).<br/>
    <button id="zoomtolausanne">Zoom to Lausanne</button> (with min resolution),<br/>
    <button id="centerlausanne">Center on Lausanne</button>
    <script type="module" src="main.js"></script>
  </body>
</html>